Switching voltage regulator for switch mode power supply with planar transformer
First Claim
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1. A switch mode power supply for supplying an output voltage and current to a load, comprising:
- a transformer including a primary winding and a secondary winding;
a primary circuit comprising a switching stage electrically coupled to the primary winding of the transformer; and
a secondary circuit connected to the secondary winding of the transformer, wherein the secondary circuit comprises a rectifier circuit electrically coupled on an input side to the secondary winding, the rectifier circuit providing a rectified output voltage to a storage capacitor, and an output circuit including a switching device electrically connected on one side of the switching device to the rectifier circuit and on another side of the switching device to one side of an output capacitor, an output terminal and an input of a voltage sensing and control circuit, and the voltage sensing and control circuit providing an output that controls switching of the switching device such that the output voltage is regulated.
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Abstract
A power supply has an output circuit for a secondary stage of a converter that switches on and off a switching device such that the output voltage of the converter is regulated across a capacitor without use of an inductor in the output circuit. For example, the switching device is a semiconductor field effect transistor controlled by a comparator. The output circuit may be used with a switch mode power supply comprising a coreless, planar isolation transformer.
18 Citations
16 Claims
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1. A switch mode power supply for supplying an output voltage and current to a load, comprising:
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a transformer including a primary winding and a secondary winding;
a primary circuit comprising a switching stage electrically coupled to the primary winding of the transformer; and
a secondary circuit connected to the secondary winding of the transformer, wherein the secondary circuit comprises a rectifier circuit electrically coupled on an input side to the secondary winding, the rectifier circuit providing a rectified output voltage to a storage capacitor, and an output circuit including a switching device electrically connected on one side of the switching device to the rectifier circuit and on another side of the switching device to one side of an output capacitor, an output terminal and an input of a voltage sensing and control circuit, and the voltage sensing and control circuit providing an output that controls switching of the switching device such that the output voltage is regulated. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An output circuit for a step-down converter, the step-down converter having an output voltage across a first lead and a second lead, the output circuit comprising:
a switching device electrically connected on one side of the switching device to the first lead and on another side of the switching device to one side of a capacitor, an output terminal and an input of a voltage sensing and control circuit, wherein the voltage sensing and control circuit is operably connected to the switching device such that the switching device regulates the output voltage of the step-down converter, the voltage sensing and control circuit switching the switching device on when the output voltage drops below a reference voltage. - View Dependent Claims (13, 14, 15, 16)
Specification